Durable Task for Microsoft Agent Framework

The `agent-framework-durabletask` library provides robust integration for orchestrating long-running agent operations within the Microsoft Agent Framework, leveraging the capabilities of Durable Task (often via Azure Durable Functions). It enables complex, stateful workflows for agent-based systems. The current version is `1.0.0b260409`, indicating a beta phase with potentially frequent updates as it evolves alongside the core `agent-framework` library.